<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    div {
      width: 200px;
      height: 200px;
      background-color: pink;
      margin: 100px auto;
    }
    div:hover{
      box-shadow: 10px 10px 10px -4px rgba(0,0,0,0.3);

    }
  /*  */
  </style>
</head>
<body>

<div></div>

</body>
</html>